Molding press



Jan. 30,' 1923.

J. H. ORDWAY. MoLDlNG PREss. Fl LED APR,

4 SHEETS-SHEET l l 'llllll Jan. 30, 1923.. 1,443,378

J. H. ORDWAY,

MoLDms PRESS. F| LED APR. 12. 1920. 4 EEEE Ts-sHr-:ET 2

4 SHEETS-SHEET 3 H HHH I J, H. -ORDWAY. MoLDlNG PRESS- FILED APR. 2,

Jan. 30, 1923.

Jan. 30', 1923. 1,443,378

J, H. ORDWAY, MoLDING PRESS. FILEDAPR. 12, 1920. 4 SHEETS-SHEET 4 YO cqparatory to lasting.

stimati Jan. 3o,f192a JOSEPH H. onnwar, or annemarie, MASSACHUSETTS.

nonnina rnnss.

Application led April 1.2;1920.V Serial VIilo!373,036.

To all/01mm tmc/,y cof/wem.' f

Be it known that I, JOSEPH H. ORDWAY, a citizen of the United States,residing at Brookline, in the county yof Norfolk and State ofMassachusetts, have invented certain new and useful, Improvements inMolding Presses, of which the following is a speciiication.-

This invention relates to improvements in presses for manipulatingplastic sheets, such as stiffening compounds, for box toes, shoecounters, or other-articles. g In U. S. Letters Patent, No.' 1,252,298,granted to me on the first day of January, 1918, Ihave described aprocess of making box toes for shoes which may include as one of itssteps the application of heat and pressure whereby a homogeneous sheetfofv composition lis molded linto the .interfibrous spaces of a sheet ora plurality of sheets of cloth thereby, byY the combination ofcoinposition and cloth, and upon the hardening of the composition,producing a sheet capable o f making, when lasted, a strongly archedtoe. Simultaneously the thickness of the sheet of compound may bereduced at its edge, or thev thickness otherwise varied, as may bedesired lfor the particular type of shoe in which it is to beused. Thepresent invention -is herein illustrated Aas applied to this process andprovides apparatus capable of receiving a bled within the upper,andsimultaneously heating, softening, and molding it into theinterfibrous spaces of the cloth therein, pre- The invention is intendedto make it possible for'one machine l with one set of dies to operate ondisks for sundry sizes of shoes, for which heretofore sundry sizes ofdies would 'have been.

needed; and to'conserve human labor and time by providing automaticaction, governing and termination of the process on each upper. Thislast mentioned objectl is accomplished by providing so that amultiplicity of the presses, four being a suitable number for ordinary'work, can be mounted within convenient reach where an operator devoting3 or 4 seconds to each in turn can keep them all at work. Other purposesand the means of attaining them appear hereinafter.

The invention can be used for vvarious purposes and embodied in variousforms.

,Y disk-or su'itably shaped sheetof the compound, assem v16 thereonwhich,

It is intended that the patent shall cover, bysuitable expression in theappended claims, whatever features of patentable novelty'exist in theinvention disclosed.

In the accompanying drawings: 'Figure 1 is aside elevation of a completemachine embodying the invention with the pressing plates in position forinsertion of the material; l

Figures 2 and 3 are similar elevations of a fragment, showing successivestages' of operation; Figure 4 is a plan of the machine; Figures 5, 6and 7 are plans of details which underlie each other in Figure 4;

Figure 5a is a front elevation' in sect-ion l on line 5a of Figure 4;

Figure 8 is a side elevationof a detail, in section on thel line 8-8 ofFigure 4; Figure 9 is a rear end elevation of parts, in section on theline 9 9 of Figure 4;

Figure 10 is a rear end elevation of parts, in section on the line 10-10of Figure 4;

Figure`11 is a plan of a detail, in section on the line 11 of Figure 10;

Figure12 is a plan of the forward port-ion of the machine on a largerscale, in-

section approximately on the line 12"-12 of Figure 13; just above thethermostat; y

Figure 13 is a front elevation of the same, in lsection on the line13-13 of Figure 12; and

Figure 14 is a front elevation in medial. section through lcertaindetails which are .seen in full elevation in Figure 13.

Referring to the drawings, 10 indicates a -base wherein is journaled ashaft 11 which, as most clearly seen in Figures4 and 9, supports looselya driving wheel 12 whose interior face constitutes' one member of aclutch, thev other member of the clutch being marked 13, splined onshaft 11 and slidablo thereon by fork 14 working against spring 15. Whenthe'clutch is set closed, the shaft 11 is thereby driven, and with itthe pinion as seen in Figures 1 and 4,.drives a larger gear ,17 set inthe middle portion of the machine on a shaft 18 which also'carries a cam19for operating the lever 20, Said lever, fulcrumed further forward inthe machine at 21, has at its rear la roller 22 riding on top of thecani, so that the rises in the cam cause depression of the forward endof the lever 20, forcing ,the upper` presser'block or plate 23 which isthere lor cated down upon the under presserblock or` plate .24. Thelatter is supportedrin-a Vsubstantially horizontal position on `foursprings 25, one at each corner, andwhen.

these yield from the position seen in Figures 1 and 2, it rests firmlyon the base 26 in the position seen in Figure 3. These springs arestili' enough to require exertion of a moderate pressure between theblocks before the under one yields. In yielding, the Alatter may beguided, as illustrated, on rods 27 on vwhich the spiral springs 125 arewound. Co-

operating with these springsis a single and powerful'spring 30 at theyother end of the lever 20, :inserted between the cam roller' 22 andthelever 2O, as seen in Figure 10. f The cam 19 is shaped with a quickrise followed by,a rest at that elevation and then gradual.

further rise, followed by quick descent to `initial point. When itbegins to turn `from the position. illustrated in Figure 1, it

quickly lifts the cam roller 22. As vthe spring 30 remains unyielding,the lever swings the upper presser block23 downward toward the lowerplate 24, engages anything that may be t-hereon, such as an upper 28with a sheet of composition assembled in' it, .l

and depresses it a little, enough to make sure that pressure equal tothe tension of the springs 25 is experienced. The rest, produced by thesemi-circular right-hand halfl of the cam as represented in Figure 1occurs here. Resumption of the rise of the cam slowly carries the under'block down, through perhaps a fourth of a revolution, until it restsagainst the firm base support 26, after which the continuation of riseresults in yielding 4of the material which*4 is between the two blocks,or else inyielding of the powerful spring 30. The limit of pressure onthe material maybe adjusted and predetermined ;by the screw setting ofthe plug 31 `whichbaclrs the spring and cam roller 22 and is held byloclr nuts 32. It is at this stage that the composition is forced intolthe interfbrous spaces, having been preliminarily softened and renderedplasticby heat during-the moderate pressure applied by springs 25. Uponthe ensuing fall of the cam, at whi'ch the spring 20 draws down the camroller, all is released and the blocks return to the positionillustrated in Figure 1.

The heating is illustrated in Figures 4,12,

' 13 and 14. Uniformity of heat is important,

for obtaining uniform results. For the particular work that is beingdescribed, it is important to supply to the press block all heat that isabstracted by the work, or lost by radiation. This might readily be doneby supplying an abundance of heat; but the leather would thereby beinjured. as the rate of abstraction may vary considerably. It

is, therefore, important to preventover-'supply of heat. To accomplishthis, the face plate of the press block is made of thin maward.

terial, for example metal; andthe heating unit is arranged close to itsinner face, spread over it, and powerful enough to put heat back intojAthat thinplate as rapidly as the shoe tip abstractsit. In practice, itscapaci'ty must exceed the normal rate of withdrawal. `The invention,therefore, makes' provision whereby it operates only intermittently,upon variations of temperature 'above and below a small-fixed range, ascontrolled by a thermostat in the midst of the block. The heating unit33 of the upper block may be of any suitable type, but itis representedas a flat unit set within the block against its removable and insulatedunder cover plate 23 (Figures 12 and 13). Asv automatic means governinguniformity of temperatureof this lplate the heating unit has in seriesblock 23 to the rear of the heating unit,

where the latter does not intervene between aol it and the face oftheplate, and is secured to the inner face ofthat plate, duly insulatedelectrically so that it is by conduction and by convection subject totemperature, conditions thereof. l-t is a lspring pressing up Withincrease of temperature, it tends to curve downward and so to break thecontact 37, which occurs when the temperalture reaches the pointpredetermined by'the setting of the screw 39, 38; and with the ensuingdecrease of temperature it curves up` ward and remakes the contact. Theheating unit thus controlled is heldagainst the inside ofthe bottomplate by pressing screws 41 whose conical points reach it from above.The heat generated close to the plate is readily transmitted through itto the material on which that'plate operates;land the thermostat causingintermittent action of the heat- -ing coil has been foundby experienceca- /pable of maintaining temperature at a fixed degree without morethan 2 to 50 variation. The under plate 24 is thin, and is maintainedmoderately-heated by a heating unit 34 ofsuitable sort, arranged beneathand in contact with the metal of the plate.

-This may be continuously conunected, or may be inv the circuitcontrolled by the thermostat; or it may at option be disconnected,

leaving the lower plate cold, which is des1rable for certaln sortsofwork. Its purpose when used'is to prevent the leather from withdrawingheat from the plastic composition, filling the leather with heat I fromthis source to a moderate degree, or

per contra, when not used, to cause the leather to withdraw heat fromthe composition by leaving the leather cool, thus hardening the lower`surface of the composition without much penetrative flow thereof.

The drawings illustrate in Figures 1-'4 a screw 60 and a pin 61,respectively forward and to the rear of the pivot 62 by which the block23 is attachedl to the lever 20, the center of gravity'of the blockbeing to 'the rear of the pivot, so that the block tends to swingforward as illustrated, with its lower face .fat an angle with the lowerblo'ck 24. Y. A.

springy 63,'strung on the rear pin, actigin conjunctionwith gravity,keeps the block 213 swung on its pivot 62 against the tip of 'screw 60so long'as Vthe blocks are apart;

and when the heavy compression comes the angle between the block facesmay be determined by the setting of screw 60. if this is Vset downenough to make a small angle,

` opening to the rear, the upper being inserted with its toepointinginto the machine, the pressure will mold a thin edge of theplastic disk across the midst of the upper, at thebe-l ginning of thetoe, as is suitable-:tor plain toed shoes, with the thickness et diskggadually increasing' toward. the iet in Figure 1. Although the machineis illustrated with dies having planefaces, it will be understood thatconcave or convex. or composite 'faces might be used. Where itis desiredto preheata large tip, one which reaches to the back of thefplates, a.withdrawal oi` the adjusting screw 60 at the iront edge lets' the backedge of the upperplate sit lower, thus 'giving more pressure ora quickercontact at the back. lln such case the spring 63 aids gravity .in makinga light and steady pressure during the preheating, so that thecomposition Vis uniformly softened over the whole area. y "fore theheavy pressure is'applied.

'The lever operating mechanism requires to be started easily 'by theoperator, and to ,be 'stoppedautomatically' with the presser blocksseparated, after application of .the

' predetermined pressures at the predetermined angle ,and temperaturefor a predetermined number of seconds.` important parts which co-operatewith others to produce this are. the springl, which when released closesthe clutch to start the machineand" thecam. pin v45 on the main gear 17which opens the clutch. `'The clutch control device comprises the fork14, the rod 44 extending therefrom and the horizontally swinging lever46, pivoted at 47 at the rear on a plate 10 fixed on the base, whichwhen set outward holds the rod 44, fork 14, and clutch member 13 open sothat the lpower is disconnected. This openingis accomplished when thecam pin 45 in the large gear 17 strikesthe cam surface 48 on an auxiliarlever 48 lwhich overlies the lever 46, is fu crumed ori-the samepivot 47with it, and acts as if integral with it,` for the instant illustratedin Figure 5a because of the latch which'connects these two. This latch,as illustrated, has the aspect of a detent pivoted on the lever 46 at49', resting thereon in the same plane with the: lever 48, and normallyv set, so that, when the cam pin 45 in its travel reaches the camsurface 48 and drives the lever 48 outward,'this pulls the rod 44 andclutch 13, cutting ofi' the power; and the pin- 45 is so set that thisoccurs when the roll 22 is at the bottom of the depression of the cam19. With the power thuscut od, and with the springs 15 and20 andthemomentum of the heavy lever 20 opposing iturtherV motion, the latterhaving to reverse its 'I awa from the lever 48, so that even though theever 48 remains engaged by the cam pin 45, the lever 46 is free of itand can swing.

inward, which it immediately does under the pull of the clutch spring15. The continuously running drive wheel 12 thereupon sets the cam' 19again in motion and the'cycle is repeated, coming toa similar stop atthe end of a single revolution of the cam 19.

rlhe various parts thus described co-operate, for the special work forwhich the illustrated specimen of the press is designed, as'follows: ltbeing desired to cause a solid homogeneous sheet oi stiiening compoundto pass intoimpregnating relation to the cloth doubler anditoe piece ofa'shoe upper;- the purpose of the mechanism is to accomplish thisautomatically and correctly. The

machine mustpass heat through the leather and cloth, either orboth'henough to soften 'the disk of composition, meanwhile guardingagainst injuring the leather by heat; must apply pressure which may beas much as f 2,000 pounds for molding the disk, from its initialparallel-sided shape to a thin edged shape, if desired, ahdto force itinto the body of cloth fabric, or, if preferred, merely to make it stickthereto; and must stop automatically when this is done. Furthermore', itis a purpose that the same machine shall be capable of treating large,or small tips;

thick and thin; and of producinga feather edge, orleaving aothick edgeoneach or all,

with standard results, according to what is' predetermined. Thespecifications to accomu plishthis in one machine, which may be Theupper plate face may be maintained by the thermostat within a range of 2to 50 in the vicinity of 210o to '2200. The machine, making a completerevolution of the cam in seconds, applies the heat for approximately 15seconds at a moderate pressure of the springs for the pre-heating, andthen continues the application of heat at the high pressure for secondsmore, during which time the iiux of composition into the cloth doublerand into the cloth toe piece occurs, and the flux into new shape asdesired for production'of the thin edge. The machine must then stop andleave the upper safe from.

the heat. All of this the machine does. The pressure is controlled bythe cam 19 and relative action of springs 25 and 30. The

intensity of heat is controlled by the ther-l mostat; the length of heatis controlled by the cam 19, speed of the' machine being taken intoaccount; and the automatic cessation of heating comes with relaxationof'pi'essure and heat by the cam pin 45, and the cam-19,

and clutch control 44, leaving the upperresting on the merely war-mlower plate to await removal.

Meanwhile, all that theoperator does is to insert thev upper and pressthe button 50.

Under these circumstances, anoperatorv can work four. machines, placingan upper in e-ach of them in turn and pushing'its button. For this, fiveseconds is ampletime;

and by the time lthe fourth is completed, the

first has done its work and is ready again.

I claim as my invention j 1. A machine having, in combination, twocio-operating dies, one of which is yieldingly supported away from aiix'ed abutment, and

the second of which is yieldingly supported away from the first die ;VandY pressingmeans for piling theI dies with material between -them onthe xed abutment to compress the material; (there being yieldable meansin the line of pressure and yielding aty a predetermined high pressure,whereby the compressionfof the material is limitedl to the saidpressure. U

2. A machine having, in combination, a

`.fixed abutment and two co-operating dies, 4 one of which is movabletoward the other and said other of which is yieldingly supported awayfromt'he abutment; means for first pressing the movable die toward thethem and .to move both dies and material simultaneously a limiteddistance against said yielding support, the same being moderatepressure; means adapted to maintain said moderate pressure for a period;means for imparting heatto the engaged material through one of said dieswhile said moderate pressure continues; means afterward operating toseat said dies and material on the abutment and to compress ythematerial thereon; and means associated with said movable die whereby theforce of compression by that Adie is limited. l

3. A machine having, in combination, two dies, means for moving andpressing one of them toward the other with moderatepressure on anarticle between them; means for imparting heat to the article throughone of them while said pressure is maintained;

Iand means for actuating the dies further closer together thereafterwith increased pressure, `there being yielding 'means responsive to saidincreased pressure whereby thel pressure between the dies may be limite1 4. machine having, in combination, a base; adie; means yieldinglysupporting the die adjacentto the base at a little distance; aco-operating die; means for moving one die toward the other, a predetervmined distance, enough -to cause the support to yield part way towardthebase; means temporarily maintaining the dies in thisposition, and meansfor moving the co-operating dieJ .further to press the first-named dieagainst the base, there being4 an element coacting withall of said meansand yieldable -under excessivepressure to limit the pressure between thedies. A

5. A machine having, in combination, a base; a die; means yieldinglysupporting the die adjacent to the base at a little distance; aIco-operating die; means for mov- `ing one die toward ,the other, apredetermined distance, enough to cause the support to yield part waytoward the base; means temporarily maintaining the dies in thisposition; means for moving the co-operating die further to press thefirst-named die against the base, and means for therei upon. increasingthe pressure between the dies,- there being an element coacting withallf'of said -means and yieldable under excessive pressure to limit thepressure between the dies.

6. A. machine having, Win combination, aA basep a die; means yieldinglysupporting the die adjacent to the base at a little distance therefrom;a zo-operating die; means 125 for moving the co-operating die toward theother die with initial pressure between them, thereby causing thesupport to yield part way toward thebase;I means maintaining the diesvin this position for a period; lQO

means for moving the co-operating die further, thereby pressing thevlirst named die against the base; and means for thereupon increasing thepressure between the dies; there being means associated withsaidcooperating die lfor yieldingly holding it at an acute angle withthe first die when the apparatus is inactive, and yielding during theinitial pressure to permit adjusting movement'of the co-operating dieface with respect to the other; and other means associated with saidc'o-operating dieV rfor limiting said adjusting movement so as to fixthe angle between the die faces during the time of increased pressure.

A machine having, in combination, a base; a die; vmeans supporting thedie adjacent to the base at a little distance; and yielding withmoderate pressure; a lever fulcrumed upon the base; a die co-operatingwith the rst die on one end of the lever;

cam engaging means mounted at the other end of the lever, yielding withheavy pressure; and a cam therefor having successively a qulck rise, arest and a Vgradual further rise whereby the die face presses y.

moderately on an article disposed between the dies, then temporarilymaintains the pressure, and iinally pressing the rst die against thebase subjects the article to increased pressure. 1

8. A machine having, in combination, ,a base; a" die; means supportingthe die adjacent to the base at a little distance; and yielding withmoderate pressure; a lever fulcrumed upon the base; a die co-operatingwith the first die on one end of the lever; cam engaging means mountedat the other end of the lever, yielding with heavy pressure; and a 'camtherefor having suc` cessively a quick rise, a rest, a gradual furtherrise and a fall whereby the die faceY presses moderately on an articledisposed between the dies, then temporarily maintains the pressure, thenpressing the iirst die against the base subjects the article toincreased pressure, and finally releases the pressure.

9. A machine having, in combination, a base; a die; means supporting thedie adjacent to the base at a little distance; and yielding withmoderate pressure; a lever fulcrumed upon the base; a die cooperatingwith the first die on one end of 4the lever; cam engaging means mountedat the other end of the lever; yielding with heavy pres; sure; and a camtherefor having successively a quick rise, a rest, a gradual furtherrise and a fall whereby the die face presses modtiti cam, and .releasedby the fall thereof, tending to swing thelever and its die away fromvthe base,` thereby releasing the article.

10. In a press for molding plastic sheets,

the combination with pressing means includ.-y

tinguished from actuation by heat proceed-l ing to it directly from thesource of heat..

11. In a press for molding plastic sheets, the combination with pressingmeans including a die plate of means immediately behind the face of thedie plate for supplying heat thereto and other means immediately behindthe die plate responsive to the temperature residual in the die plateand adapted to control the supply of heat to said heating supply means;said responsive means being adapted to establish the supply when saidresidual temperature falls below @predetermined point land to interruptthe supply when said temperature rises above saidl point.

12. The combination with a hollow pressing block of electricalmeanswithin the hollow lof the block for heating the pressing face thereof,and a thermostat arranged within said hollow in position to be governedby temperature of the said face and controlling the supply ot ycurrentto saidheating means. 13. The combination with a hollow pressing blockof an electrical heating unit held against the inside face-of the wallof the block whose outside face constitutes the pressing face; and athermostat set mainly in air` within the hollow in immediate proximityto another part 'of said inside face and controlling the supply ofcurrent to the heating unit. A

14. The combination with pressing means including a die plate ofelectric means for plying current thereto;a thermostat and means therebyto maintain the die approximately at predetermined temperaturecomprising the arrangement of a thermostatic element forming part of theelectric circuit insufficiently close proximity to and approximateparallelism with the said die plate so as to receive heat therefromdirectly by conduction, convection and radiation; alter.- minusadjustable in position with which the thermostatic element is adapted tobreak contact upon its movement which ensues on increase of heat andmicrometer manual means to set the position of said contact terminals invarious predetermined positions.

15. A press having, in combination, a hollow pressing block; having athin face plate; a heating unit held against the inside of the n n aplate; a thermostatic spring mainly in air iia iat

ase

within-.theblock, secured to the innereface of the plate and receivingheat therefrom by conduction, and arranged'at-one side of the heatingunit thereby receiving a minimum ofy heat therefrom directly; andadaptedto control the supply of heat.A p 6. A ress having, incombination, two co-operating dies,a heating unit for each die, means'continuously supplying a low, de- -gree of heat to one, andmeansautomatically controlling the supply of heat to the other of the dies,according to th'e temperature. thereof, to maintain a 4 predeterminedhightem-. perature therein.

17. A press adapted to force sheetsof fabric and composition together,comprising in combination, two diesadapted, respectively, to engage onthe side ofthe fabric sheet and the composition Sheet, a heating unit'for each of the dies, and means whelreby he supply of heat Ato theconi'position side unit may be connected and interrupted automaticallyaccording to the rate of lescape of heat from v, its die, to'. apredetermined high temperature to render the compositionplastic, but notlfluid; the said heating unit for the fabric side die being adapted toimpart a temperature tothe fabric to prevent it from cooling belowplasticity the composition forcedinto' it by the high temperature die. Y

18. A press for sheets ofcomposition 1n solid form adapted for moldingthe same with fabric for box toes comprising two (3o-operating dieplates adapted to receive between them al sheet of fabric and a sheet ofcomposition, the said die plates having their faces diverging fromparallelism 4by a small angle an element for forcing them together atthls angle, arranged for the apex of theangle t0 be at the back edgeofthe box toe, -whereby the composition is molded thin at its edge whichcrosses the upper.

19. A press having, in combination, a

relatively stationary die, a relatively movable die, operating meanspivotally holding the movable die and automatically liftingit` at apredetermined interval, and means respectrvely forwardand to the rear ofthe pivotaLpoint forimaintaining the relatively movabledie in positionwhile. lifted, one of said last means being yielding. J 20. A pressuhaving, in combination, two

` dies adapted to co-operate with their faces at ka variable smallangle; means yieldingly maintaining-one of the dies at an angle to theother approximating said variable angle,

and .a pressure element, pivotally holding the die which is thusmaintained, whereby the die, under thepressure thereof, is shifted to anangle depending upon the resistance of different parts of the materialcompressed between ,the dies, and automatically returns to said anglewhen relieved of said pressure.

21. A press having, in combination, two

-diesadaptedito coloperate with their faces ata-variable smal angle;means yieldingly maintainin'gone of the dies at an angle to the otherapproximating said variable-angle,

'n.withitseapex pointing in the direction in -fwhich thematerial to bepressed is inserted,

anda pressure element, pivotally holding the die which isthusmaintained, whereby the die, under the pressure thereof, is shiftedto an angle dependingupon the resistance Iofvdierent parts ofthe'material compressed between the ilies, and automaticllyreturns tosaid anglewhen relieved of said pressure? 4 A'22. A pres'shaving, incombination, two plane faced dies, the edge of one of which yis -movableagainst. the face of the other,

and supports for them both, rigid up `to the maximum predeterminedpressure,

lwhereby one is set so that their faces are at a small angleto eachother, and adapted to cooperate in molding a'vamp for a box toell 23. Apress having, in combination, two

Vco-o eratin die lates' means to move one 7 co-operating die plates; andmeans to move one of them toward the other; one being horizontal and theother descending upon 1t' being-pivotally supported y.at a point whereatthe pressure is communicated to it, said point movin vin a predeterminedath and being located beside its center o gravity whereby the plate bygravity hangs with one edge in advance of the other, thereby introducinga lateral component into the final portion of its motion toward theunder die plate. y L

26. A press having two co-operating die em toward the ether, the platesbeing plates and an element moving in a fixed path forcing and having apivotal support for one of them, moving it toward the other of them,combined with supplemental means yieldingly holding one part ofrtheplate in advance of theother, whereby pressure is exerted by the advance`part of the plate in addition to the pressure thereof transmittedthrough said pivotal attachment. 1

27. A press-having two co-operating die plates and an element moving ina xed path forcing and having a pivotal support for one of'them, movingit toward the other ,of them, combinedwith supplemental means yieldinglyholding one part of the plate in:VV

advance of the other, whereby auxiliary pressure is exerted by theadvanced part .of the plate in addition to lthe pressure l thereoftransmitted through said pivotal attachment; and means tvo-vary the.said aux- 111ary pressure.

' path forcin and having a pivotal support for one of t em, moving ittoward the other of them, combined with supplemental means yieldinglyholding one part of the plate in advance of the; other, wherebyauxiliary pressure is exerted by the advanced part of the plate inaddition to the pressure thereof transmitted throughl said pivotalattachment; there being for said auxiliary pressure a rod passingloosely through said pressing element from said advance portion backwardthrough said moving element; a

ble die; pivotal-contact means for pressing' the movable die toward theother with its face at a predeterminedangle and yielding supportsbetween said pressing means and movable-die at-each sideof the axis ofthe pivotal contact whereby the die, approaching at the predeterminedangle, yields therefrom to a different angular position according to therelative resistance encountered on opposite sides of said pivotal axisthrough Whichthe ultimate pressure is applied to it.

Signed at March; 1920.

v JOSEPH H. OR-DWAY.

Boston, Mass., this 31st day of

